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A group of similar cells & extracellular products that carry out common functions.
The study of tissues & their relationships within organs.
What are the four tissue types in the body?
- 1) Epithelial
- 2) Connective
- 3) Muscle
- 4) Nervous
Tissues are formed from what 3 primary germ layers?
- 1) Ectoderm ("ecto" = outside/external; "derm" = skin)
- 2) Mesoderm
- 3) Endoderm
What does the EXTRACELLULAR MATRIX, compose of?
Water, protein fibers, and dissolved macromolecules.
What is the EPITHELIAL TISSUE?
Covers or lines every body surface and all body cavities.
Forms internal/external lining of many organs
*NO blood vessels penetrate epithelial cells.
Characteristics of EPITHELIAL TISSUE.
High regeneration capacity
Cellularity: ET is almost all cells.
Polarity: free/top surface, fixed/bottom surfaces.
Attachment: Bound to thin basement membrane.
Avascularity: All EC lack blood vessels (none can penetrate)
Innervation: Environment detection.
Regeneration: frequently damaged but replaced similarly.
Functions of Epithelial Tissue.
Physical protection: ET protect both exposed & internal surfaces from dehydration, abrasion, and destruction.
S. Permeability: All E. cells act as "gatekeepers".
Secretions: secretion through Exocrine glands.
Sensations: Detect changes in the external environment..
Describe the basement membrane, its origins, and its functions.
A thin extracellular layer between the connective tissue & the epithelium.
Functions to form a molecular barrier between the epithelial and connective tissue.